Missing event type for EventGrid

Refer to [Event types](https://docs.microsoft.com/en-us/azure/event-grid/event-schema-subscriptions#available-event-types)

The eventual success and failure of a resource action will be reported by:
Microsoft.Resources.ResourceActionSuccess, or
Microsoft.Resources.ResourceActionFailure

However, my use-case is to monitor and react to an action that has been **Started** on a resource (example: VM restart).
The end result event (example: VM restart success) is usually delayed (in the order of few minutes), so this does not serve my purpose.

I would like to request that the following event type be added:
Microsoft.Resources.ResourceActionStarted

Thanks,
Sourabh

Start with the linked Azure Event types documentation and compare the existing success and failure event types with the requested ResourceActionStarted event. No repository file, test, or entry point is identified in the issue, so first determine whether EventGrid supports this event and where its API specification is maintained. Done means the event type is officially supported and represented in the appropriate specification.

Written by the indexing model from the issue text.